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<title>Octave Fuzzy Logic Toolkit: addrule</title>
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Function Reference: <b><code>addrule</code></b>
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<dt><u>Function File:</u> <var>fis</var> = <b>addrule</b><i> (<var>fis</var>, <var>rule_matrix</var>)</i></dt>
</dl>
<p> Add a list of rules to an existing FIS structure and return
the updated FIS.
</p>
<div class="ms-5">
<p> Each row of the <var>rule_matrix</var> represents one rule and has the form:
</p>
<pre class="verbatim"> [in1_mf ... inM_mf out1_mf ... outN_mf weight connect]
</pre>
<p> where:
</p>
<table>
<thead><tr><th width="25%">Element in Rule Vector</th><th width="70%">Expected Type or Value</th></tr></thead>
<tr><td width="25%">in<i>_mf</td><td width="70%">membership function index for input i</td></tr>
<tr><td width="25%">out<j>_mf</td><td width="70%">membership function index for output j</td></tr>
<tr><td width="25%">weight</td><td width="70%">relative weight of the rule (0 <= weight <= 1)</td></tr>
<tr><td width="25%">connect</td><td width="70%">antecedent connective (1 == and; 2 == or)</td></tr>
<tr><td width="25%"> </td><td width="70%"> </td></tr>
<thead><tr><th width="25%">Hedge String</th><th width="70%">Effect of Applying Hedge</th></tr></thead>
<tr><td width="25%">"not"</td><td width="70%">prepend a minus sign to the membership function index</td></tr>
<tr><td width="25%">"somewhat"</td><td width="70%">append ".05" to the membership function index</td></tr>
<tr><td width="25%">"very"</td><td width="70%">append ".20" to the membership function index</td></tr>
<tr><td width="25%">"extremely"</td><td width="70%">append ".30" to the membership function index</td></tr>
<tr><td width="25%">"very very"</td><td width="70%">append ".40" to the membership function index</td></tr>
<tr><td width="25%">custom hedge</td><td width="70%">append .xy, where x.y is the degree to which the membership
value should be raised, to the membership function index</td></tr>
</table>
<br>
<p> To omit an input or output, use 0 for the membership function index.
The consequent connective is always "and".
</p>
<p> For example, to express:
</p>
<pre class="verbatim"> "If (input_1 is mf_2) or (input_3 is not mf_1) or (input_4 is very mf_1),
then (output_1 is mf_2) and (output_2 is mf_1^0.3)."
</pre>
<p> with weight 1, the corresponding row of <var>rule_matrix</var> would be:
</p>
<pre class="verbatim"> [2 0 -1 4.2 2 1.03 1 2]
</pre>
<p> For a complete example that uses addrule, see heart_disease_demo_1.m.
</p>
<p> <strong>See also: </strong>
<a href="heart_disease_demo_1.html">heart_disease_demo_1</a>,
<a href="showrule.html">showrule</a>
</p>
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